Harry w



H. W. NEAL.

FURNACE CASING.

APPLICATlON FILED MAY 31. ms.

Patented Aug. 22, 1916.

were sense an anion.

HARRY W. NEAL, OF INDIANAPOLIS, INDIANA, ASSIGNOR OF ONE-HALF TO HALLHARDWARE COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION.

FURNACE-CASING.

Specification of Letters Patent.

Patented Aug. 22, 1916.

To all whom it may concern:

Be it known that I, HARRY W. NEAL, a citizen of the United States,residing at Indianapolis, in the county of Marion and State of Indiana,have invented certain new and useful Improvements in Furnace-Oasings, ofwhich the following is a specification.

This invention relates to a sectional casing or jacket for portableheating furnaces; and one'of the objects of the invention is to providea sheet metal casing for portable furnaceswhich is formed of a number ofvertical sections, extending from the baseplate to and supporting thefurnace hood, thereby enabling the casing to be completely built in theshop; knocked-down for shipment, and readily reassembled at the placewhere the furnace is to be installed.

A further object of the invention in forming the furnace casing of anumber of vertical sections extending from the base-plate to the hood,renders the interior of the furnace readily accessible for makingrepairs both above and below the grate-bars after a single section isremoved.

A still further object of the invention in formin the furnace casing ofa number of vertical sections is that it enables me to shift, or causeone or more of the sections to be interchanged, so as to change theair-intake to meet varying building construction conditions.

A still further object of the invention consists in providing eachcasing section with an inner lining to form dead-air spaces forresisting the chill of the exterior atmos phere and in reducing thevolume of heat dissipated through the medium of radiation.

A still further object of the invention consists in the provision of afurnace casing composed of a plurality of vertical sections which arejoined together by means of suitable jOints whereby the sections areeasily set up or taken down and which exclude dust from gaining accessto the interior of the furnace between said casing sections.

There are other objects which will appear from a perusal of thefollowing descrlpti-on and claims.

builders plans, so t I accomplish the objects of the invention by meansof the construction illustrated in the accompanying drawings, forming apart hereof, in which Figure l is a perspective view of a portableheating furnace, showing my improved sectional casing or jacket inoperative position. Fig. 2 is a top or plan view of the casing, the hoodand its connecting band being omitted. Fig. 3 is a fragmentary detailhorizontal sectional view, on an enlarged scale, showing the formationof the joints for connecting the casing sections together. Fig. 4 is afragmentary detail vertical sectional view, showing the band forattaching the 11 per ends of the casing sections.

Re erring to the drawings, 10 represents the furnace proper, of anyconventional style, which is inclosed by means of a casing to which thepresent invention is directed. The furnace 10 is mounted upon a suitablebase-plate 11, which base also supports the casing. The casing in thepresent case is composed of a plurality of vertically disposed sections12 which are provided with suitable connections to enable said sectionsto be readily assembled or disassembled. WVhen the casing is occupyingan operative position, the removal of a single section, extending fromthe base-plate 11 to the furnace hood, renders the interior of thefurnace accessible, permitting repairs to be made above and below thegrate -bars. Forming the casing of a plurality of vertically disposedsections also permits the sec tions to be shifted or interchanged, whichis not only desirable but important. For instance, the position of theair intake may be changed from the osition shown in the iiat theposition of the casing section carrying the inlet opening and sleeve 15must be changed, which is liable to occur during the construction ofsections occupy operative position. With the above ends in view, I formthe connecting joints between the sections 12, as shown in Fig. 8 of thedrawings, by bending the metal along one side edge of each section intoan outwardly disposed rib 13, the free edge 14 of the section extendingin a direction at right angles to-the body of said rib 13. The adjacentcasing section edge is bent to form an outwardly disposed rib 16,similar to rib 13, while the free edge 17 is bent back and thencebrought forward to form a rib 18 which is disposed at right angles torib 16. This reverse bending of the edge 17 provides a pocket 20 adaptedto receive the free'edge or tongue 14, on the adjacent section, andforming a joint to prevent the passage of dust between the sections 12.When the sections are joined together ribs 13 and 16 are brought closetogether,

and by passing suitable, stove-bolts 22 through registering apertures 23located in said ribs, the sections 12 are held positively together. Theupper ends of the sections 12 are secured to a circumferentiallyextending band 25 by means of the bolts 26, the said band also formingthe means for supporting and for securing the furnace hood 28.

Each casing section 12 carries an inner wall or lining .30 composed ofsheet metal, the said inner wall being arranged to provide interveningdead-air spaces or pockets 31 between said inner wall and section. Asconfined air is a poor conductor of heat, these dead-air spaces 31 servethe purposes of resisting the chilling effect of the atmosphere outsidethe casing, and also in reducing the amount of heat dissipated throughradiation. The inner walls 30 are anchored only at one end by insertingthe one end into a pocket formed in bending Y rib 13, and are heldfirmly in place by means of the stove-bolts 22 which secure sections 12together. The opposite ends of the walls 30 are loosely inserted underribs 18, the latter holding the ends of the walls down upon the innersurface of the sections 12, and are thus free to move longitudinallywhen expanding and contracting. As the walls 30 are nearer the fire-potof the furnace and are thus subjected to greater heat than the casingwhich is also protected by the deadair pockets 31, the said walls 30 aresubject to greater expansion and contraction than the casing, and forthis reason one end of the walls 80 are left free. The walls 30 arepreferably provided with a centrally located longitudinally extendingcorrugation 33 which bears against the inner surface of the sections 12.In view of the fact that the walls 30 are formed on a curve and subjectto a high degree of heat, there is a tendency on part of the Walls tobecome distorted and bulge outwardly, and to prevent this disarrangementof the walls 30 the corrugations 33 are provided to support the centralportion thereof.

\Vhile I have described my invention with more or less minuteness asregards details of construction and arrangement, and as being embodiedin certain precise forms, I do not desire to be limited thereto undulyor any more than is pointed out in the claims. On the contrary, Icontemplate all proper changes in form, construction and arrangement,the omission of immaterial elements, and the substitution of equivalentsas circumstances may suggest or necessity render expedient.

I claim 1. A furnace casing comprising a plurality of verticallydisposed sections, interlocking means carried by each section forconnecting said sections together, said interlocking means consisting inbending the metal along one edge-of each section into an outwardlydisposed rib with the free edge of the section projecting at rightangles to said rib, an outwardly disposed rib formed along the oppositeedge of each section, a horizontally disposed rib formed by bending theremaining free edge of the section in reverse directions to form apocket adapted to receive the right angle projecting edge on theadjacent section and means for drawing the outwardly disposed ribs onthe adjacent sections toward each other into operative position.

2. A furnace casing comprising a plurality of vertically disposedsections, interlocking means carried by each section for connecting saidsections together, said interlocking means consisting in bending themetal alon one edge of each section into an outwardly disposed rib withthe free edge of each section projecting at right angles to said rib, anoutwardly disposed rib formed along the opposite edge of each section, ahorizontally disposed rib formed by bending the remaining free edge ofthe section in reverse directions to form a pocket adapted to receivethe right angle projecting edge on the adjacent section, and means fordrawing the outwardly disposed ribs on the adjacent sections toward eachinto operative position.

3. A furnace casing comprising a'plurality of vertically disposedsections, interlocking means carried by each section for connecting saidsections together, said interlocking means consisting in bending themetal along one edge of each section into an outwardly disposed rib andproviding a recess for anchoring the inner wall, the free edge of thesection projecting laterally of said rib, an outwardly disposed ribformed along the opposite edge, a horizontally disposed rib formed bybending the remaining free edge of the section in reverse directions toform a pocket adapted to receive the right angle projecting edge on theadjacent section, said horizontal rib standing remotely from the face ofthe section and providing a slot adapted to receive the free end of theinner wall, and an inner Wall anchored at one end in one of the pocketsin the sec tion and providing dead-air spaces for insulating said casingagainst too rapid radia- 10 tion of heat.

In witness whereof I have hereunto set my hand and seal, atIndianapolis, Indiana, this 24th day of May, A. D. one thousand ninehundred and sixteen.

HARRY W. NEAL. [L.s.]

